IT IS OK, AT ANY TIME, TO SAY "I CAN'T SUPPORT THIS. I WAS WRONG, AND I AM GOING TO DO THE RIGHT THING GOING FORWARD." THE SECOND-BEST TIME TO BE RIGHT IS NOW.
SOME THINGS ARE SO OBVIOUSLY STUPID THAT THIS DOES NOT APPLY, LIKE SUPPORTING THE OFFENSIVE WAR ON IRAN. IT WAS WRONG 22 YEARS AGO TO SUPPORT VIOLENT REGIME CHANGE IN IRAQ, AND YOU SHOULD HAVE LEARNED YOUR LESSON.